I have the 10 episodes of Missing sitting on my Tivo and I'm trying to decide if I should watch it. Without giving anything specific about the show away, can you tell me if the main story line wraps itself up by the end of the season?

I really don't want to waste 7.5 hours watching a show that going to be open ended and is already cancelled. I don't need every single little thread tied up completely but I really don't want to bother if the main plot line remains unresolved by the end of the season/series.

You'll get rather good closure on pretty much everything if you stop watching the finale about a minute before it otherwise ends. They threw in a cliffhanger at the very end of the episode to start the next season. It's not that major and easily ignored given the rest of the show, but if you want a completely clean series, keep that in mind.